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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b631b02c42fe809e3f7af971af6b823621c039f378d2a80615d0f904210ec483' 
  AND token = 'l+QzQMBTcF1+carFowTfL22WQENyIYLSwJAiL979dCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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