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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da5f3a34e78a5b4c827c8c33b5f4e5f21c0e659e87744c7242d0dad72eb6d75' 
  AND token = 'C4oRQfSaSdnAMJhuwoQUS5/NHxwwyMVbRUd/u5fbihk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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