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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e3d040ecb7b04fee5d29fbcbdb8a743e3ca6825f535991f15cbe99893a5475' 
  AND token = 'll+OdD+4MH6ws/+JWYPFOrFzYmIyepYWEubFx1I6uyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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