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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3852a95087036a5e57126a18d156d835eb06f9630c16408acc02eb6ce5308d9' 
  AND token = '81V00MspHBnsm59AS8YAvtuNe1BNP5P2oqt89BztQW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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