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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d60987f342f75795f53a81f5f5eb017757affe526fd624ef75c21124ee9226' 
  AND token = 'gmA26MTxPJjuVk292B2cSy6Ob/dFdONDYCdaKRZLCOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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