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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184fb84087cc92c12be09140f8ada1fab7d70796e0bbad90cdf4277e906d168f' 
  AND token = 'Ih4Y8cJFwW0vzZIH4lDZJkDLb9ver2YDdQWvt2wjeQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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