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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b9d888a765db63e980da8b55e6aba7a84bd169155320781e3bd90d958fe8bd8' 
  AND token = 'HGa4RWcnCXP6bu/MEkzlAxKe+XF92OGEimqdLJGk3/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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