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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e7b6798785102b563733e677b964abf1a0166e2268d57d4239d65d8390b71f' 
  AND token = 'waZ0tnpxEuBIVNS+Vw9+jg2lBFilA+El2oPD13xQ+kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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