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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50a290b45196100a5699a514261bb723fe87e84141244e291db15b0781381190' 
  AND token = 'NWyc74C12S3uhIigwRMV3X8vskySkqQruQ5ehD+u7BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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