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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48fb968570f356f06baf500d4fc6ecea75b1eba460e2431c0ed01acff631826c' 
  AND token = 'N9SpAKcgDHJNICfcKxSZqqU3O8Cn9zt082sno9B3u5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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