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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f7af4c28447bf3095d2d0f528f7990eea9d53c9e875b7c9d34ac26a6a45e6d' 
  AND token = 'nsF45W/76MuQt4RqLcbib9KQa2bTQbmW9DiTb8YSHik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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