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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13b5ed2854a1cc9e506cd78316236085183288d7535942fb9bf605b62c0198d' 
  AND token = 'l/sZ03JG8zkayGIcOfTECK2pBXfnFq1x8iHh81+qf0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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