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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f36f200a88e9b096ed2bff504fbfdbef0d0a5fc1cb5585602f63e8b7eca18a1' 
  AND token = 'Rq4NyqdXjlJd0NcbqfNx31H6O1G/7LLYPMG0Vn/DeWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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