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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aacd654ebe4812cb1a50e7ed4b06595e24575644f9fb63737a054c3eede640d' 
  AND token = '01Kusrc8vz8mDi3lXoGh/18WMHX/FCNkbgJdD8yJOm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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