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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074de4cc537ad5d599efee344f94152bcb97b6fc3dd5476c60e88f59ff31cb81' 
  AND token = 'ctbzy0J5pcI/P8yKD7rAIfsMUo3IX26vX5TBNNmKiaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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