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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5854e9017b4ae35c85d15847d861678e89709a99415d70a86acd9111d12e0289' 
  AND token = 'jl4DA18Jdapy5T22z3lIiOYfLwXS7wWDngResxHSXCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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