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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f38da700daa18473bb5d8f8caeb286cb3c88ad435e476dffa0aa72b44be58d3' 
  AND token = 'N+zRHB7PCMhQn8EcaPRj97QPpT3jxBQmVVNJi0eQZVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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