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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619d76a4ff378b0033f3ed6d6db381ba1a3db25b9a6efd49f5a53f83edb0b8bc' 
  AND token = '68StxMq6izpVxlKYyE2uBuyakg1TchFQD0cj8lDDUmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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