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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a4a2e3582aa9aea04c6af997d83b61f856bfc00e33d69bb9b4f6c585d721d9' 
  AND token = 'BRqanuuA5eVPdqJUoyfm5WcBeDBDa+J1wH+WJ0/O0RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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