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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896205a10da9e7eee7fb8a5484732119cb62ef5be61c1e416de4f5e5cfd981f4' 
  AND token = '4roliDcg4IDOWDu+4diCcMfmk0NaQ3jx5tHfdlLZsaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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