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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b347b1ce70b2ccebb61a6eaa42e975b89d43af4ac71a4989920810e19ea134' 
  AND token = 'EEPg0DE1HRKtBIbmEhCNHdb+9Um39vJEQRqJH00a/PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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