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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38029599598f86d34611957bd8a1dfe0414b693be88eb78ce0e3e12a23692072' 
  AND token = 'prvmeDlFKzO1Fpqv7rWrN4US3vWG5dE9+RyVc3KOMm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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