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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '427476bfc9c5e4ed058e0bb34560167f6a212ceadb9b4435a7c54daaa475b975' 
  AND token = 'IFLJ6t6mqXtMqWOtQuTUG3fKkzvfW/4HbdMfUwzEnYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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