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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '024e7f368d05f15287954f315d846fe8f9a3db920283e85e8cdcc10a53bc6949' 
  AND token = 'nS+pmmLKWa48jdvb0ZzYWyJzNX4t1HRTaqdFUuPoJ80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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