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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a6c559eb549da3e2d8247eb68abebb6fea0ffa24e46b4aa2b84996d3c67f28' 
  AND token = 'axbWkFrhWOpfG4QoVCwW6VC4TfWxUXOtYhJuRHYw8MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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