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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf50fe3c3a3906cefa6146a9d62ab231c8f50d361d010edbebf819a9fd20c79' 
  AND token = 'cSDw0mCwFyJpvoRtV7/DHi8yMGjn0a53jSp131vUCY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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