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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04394783ba05d380aa28d6d53907b06b6c6fa547908430510a1ce27e862eb710' 
  AND token = '4cdgsKEKq2xDcyoHLrCo6XLQeexNdCZ8UBBrfSAD16g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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