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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb0ab97aecc19dda93a13006c15b59aba786a283cad36b220d58840f56437df' 
  AND token = 'Jr61GsylDXI/FIFtus/lRRe/AHUyu93UJfJaiK62Z1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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