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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd203210296a974a71afc9328a6b6a4bc97ffffce1186b225af10b1a9708f98' 
  AND token = '+YFTr3d2eNLZfjBRvq4C9BUYP1BrYduhW4474IKlnj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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