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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0620f978d224fcf5b99768e42a8ae0a939d007838cf4254e6bff0cc4842775ee' 
  AND token = 'pqKnbgIwboKKIzrIx+n84dNzMySBCJ8txMgWSI++yGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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