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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee8f886aa414e6a1e87a6e97a7fa2c97959daf544e1a8fc9ac220e89d0c595f' 
  AND token = '/ua7eaV8/MRbsFL69IX5yBKfQF670C+cJ8kzufpf278=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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