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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '656df020c180e9adc72e3d0284423700b0a8222a287cea7af356113c41317c70' 
  AND token = 'npRYQnNcv7AwAPp12jn7Z/oRvYiy2ndaGmICpUnN6Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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