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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5826d0dbbf7f75f01cec680fae9f173dc78113ea2d407fdf3c9802a24feccf7' 
  AND token = 'B3vAI56nriuN6UlCIQbV0YaygOfKjHTuTMis9lIOwvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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