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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d369d9f34e2f6394dd3516a016b4b7635a8e13e3227fdf9c8d05230cabbfe02' 
  AND token = 'V0TQTOR0xIS5Cr6C7upfVEcVqvowkrUetrNConDbW6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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