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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce136ee08a20dafb608345db8e1f682b7a8ab3ab44279387c2fd37de8c75e895' 
  AND token = 'tggC87Gh7pxcrG7h4EKUnWYC4xd7GLOfBYtRfmJE2QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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