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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f662cdfaf4af9555b6df6be1f5712dcbf58fad82f3b8160ca89ddebd628d4d' 
  AND token = 'u1Kx5x5ySbsOo8eg0pCl2r9MG3uT6nVoYlEX5R6Jo5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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