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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '210f7ef9c6deda87466b81346a3ff4b51048b4ce3d2bf5116d68ceadec00f00d' 
  AND token = '8186tXaXUDQuT0nbPPgPJ8MV+94WWOYKY0AyC8NAjWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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