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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569d535d464b2ab299a5a72e70dcb7cffd44102055b946a6daa7725bb61a92f3' 
  AND token = 'smQLu8mP8WXTn5RT6YG4NyQAT/bq9YssWDoFvK6X7Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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