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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7459ac6849315af5b5a1538a7814f401ac53a31cfebee3fef59701854e6eb3' 
  AND token = 'PxM+6Qp/4wMffmqUgYK/nd3I8Kd7tYx9kRKr4u/Y7ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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