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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e6378d4180b40dcc1de9f8fac8506f903d44daad2bce15aa175d01b47e7c4c' 
  AND token = 'wj08eAPqVv7Y8nSyki5W9q4XuQVh5+Rthm2qAEgA3yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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