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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '047d94cef4d6b8d99904d7ca3e689b444cbf46d164dc376ddc39c90ccbebbec0' 
  AND token = 'gDpn2c3BEnk4Oka7l2Ti5e4LmQMQdqup5SKS6GebV88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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