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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b7a9a99481c604db3df2f7135050789c2fa3cf5c9174f6a99bfa09f6e2e3e0' 
  AND token = 'Ll22+cb/n0OfENzzojmdtCVQ7WYNYH75Q/gwSGWfP4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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