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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00514b591dc5b7e40dd118f9ba27fabee5fe45ee97ae373d11fb5a3a434a9c6' 
  AND token = 'o7+jjzj4Qa3dflnxiMqovY+P4Gib0Hwy+JeR/U53tr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}