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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65effa1b282e572e5b5c9d63314b3871fde6ec359df36dc189ebda81519f85db' 
  AND token = 'NeNXjowIbKkHWezcvak5OZoDLCKHy4b0/LgyFxLEYF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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