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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda7943f35184567f5adf63c76f912fd102962abd3fc7ff2312e3336d51efb5a' 
  AND token = '5snjDDRzIySHwzWZZIFSXnPjK+anEV76/I7kPCHzC6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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