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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a99fc3ddd12d0708a543d074243eb9917f81667e003807d4abb96a82891740' 
  AND token = 'AhNzn9eDoDictyYck/+ObqoMVbWg7jDd7JC0GE6LWsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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