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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82848373ee5886839f79c9e9219cc1fe0939e1cf6d2af2c89169ced29f33db8' 
  AND token = 'gICgqij0pjl8D4IAex2rCc8oEdPPGkSMQc9eDVS+ISU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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