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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f70b1fc0dab855afba1c991ade7da53b2963e777ee42e12d980a41891852ed' 
  AND token = 'fw0wtxZEcyQh9H1BF3fphN6VWMBxuHGkEinYaBlkHRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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