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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8a9dc2c04464dab20d637d4cf4e2bd15a71dce56965d199f954542f37797a8' 
  AND token = 'NF0YsNXmMlXk8rCuiGR+c0XZY8/Xqd0l3p9HcmFtn0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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