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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8e358d509bab5774eab00fa154df80be625a6c22f02d4ecc32c9d897bd22f8' 
  AND token = 'K12LXl3+QPqCCbSwHUJN71iveouM7SZ5HCrm6X1ecE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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