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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6dc7b88bd2d7cd640ba6b13d2101ca54207d1a21013607c610f07a2b1cc2b8c' 
  AND token = 'bqK9gav7t2/f4iTRNdgYag9YRClJ5kkoLcn5GSoVoZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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