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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684ad9d5b9d735a34f2be8e2208d2067d6bc413ae1c599833b6802d16109fd3a' 
  AND token = 'wTtfTCUoSWDz+ON7UDACwdSRqJjcv5Py92T0NM9miGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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