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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a2d4ba1930259df92673dd782bc0e7e3d58f8f23c84866da7f1740fc18c070' 
  AND token = 'J3pviNTcTvQUtxXijTiVG+R+z7qrs2LeFDKtyKUjb+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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