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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ef98ed6c2cb3ebedf391ba657c0ebd64b38cd16a6bad0d73bb4d045a50d3fda' 
  AND token = 'bqvCCz3PX7KJJpOks7lAQmHCPET5UYzCw3s8sj3Gqno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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