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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f596b47824bab1123972dec874f132b32d5ca11aaf338776f6b31d9c96ab8aef' 
  AND token = 'GZpmlMTY5pgyIxRp5oRUvJ34h+fcFdt6lTeyhUM81Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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