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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa18d43f213a942afc534c8496ed0139edcb2b05e8a697c520ae5b1203f9c64b' 
  AND token = 'mdyIVDd3mQ+WpeGE0Nji5itwo1Dnx5uro9agxsuJFBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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