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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0ba9591adb5ac3c4709f48b7afef45da315f77772be3aaa369813fb18e883d' 
  AND token = 'CLMHra9OrDeZjqAPiXT8xFe+8q9HhEL0py5L/S1llMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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