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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc12f77cda69f389484d7efba347999dd2ab2ffc0a6a5aa4fbf2cee5e0794a7a' 
  AND token = 'zrb4p9LT3r/5o4zuumYjBRaJ6wkQ4ddUMbiIBnstl/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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