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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c7f66f1db825e828538767552588e695c8ae55a4ae334d9fab03d706f1a345' 
  AND token = 'Y49BcE0HfQWV26sRYyrlKotNycBEMzUTrOPN3dWwYbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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