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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9dd9180c9fe7456aa80c99301ce30ceef4f5614e8f679c17d849881ae9878e' 
  AND token = 'udXv5uDc0EToUaOGtAogUWK/6/npk8il7iL3gEVhJNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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