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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fbd6ce080f9e288fd0dc28c23604e9b33f4d8887be222defb14aea541f482ab' 
  AND token = 'NbWtPrHJC9GUtNoNqsVi8f4vV+ioNgumDTK6scVuAe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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