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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5cac77a1fd2962195677f2da14cabf7415db487ae5231e6185e5a7df8849e3' 
  AND token = 'fTOnda1onPO006UVKvvaA190+icLlJ8k50y7WYqNWas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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