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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70321fbb4b328a2d2edc18ec1a61b43b445e846d16cee9c0966cf57e7e42cd1' 
  AND token = 't6RUYCu5cg57aY5hoFuDi/gKJU+nsEpRwbPvAVcbjIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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