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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e58a1890831b5d3ff95b7590982fd8f691eabb5bf99c35e297df2bf32c97fdc' 
  AND token = '+8LPrw+da0kcBik9XFWxftpcQdPPUR0dlz7fDSFt4ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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