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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9540dd4989cb455e89275eef2b5e80b5e95eeb62712f7334f67b61ea688d5f8' 
  AND token = 'l4F3x5ekO6c1+jNFyKL7sFdTtw7jBoeWcbP+h8w8aso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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