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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e2c519c1841cc08e0341df3f9f7dcd100d5622e267219e869c5e61e87d0768' 
  AND token = 'D9Uzl+VxbakRPNGrMJn8MsNlO0pjCY2fKSto+vskG5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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