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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e03626b3ef378a057388fd71b1156f317d4eb15221a3eb9adb920e81cdd461e2' 
  AND token = '4UO2ZoR1s7SHzm5WtP3U7mf5etU5TZzlFZr8D0Hk76U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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