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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e52d567a16fae28d35ac037be5bb08b2969a4f46ff1b6ce241db5c20346cd0' 
  AND token = 'PyN020UZF43BmaqaiiBIE5sAfT3KBTMknSUIgjmZoNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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