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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829cc60b80aca6fc167bc6a3f73ea2f13d68b99cab681456ce61e092b7228189' 
  AND token = 'La3G+VFrWHv0o0rJFqFBOn9/Rnct+fISiuHzB3jv9ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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