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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91f86411effa7916d99334138f24e263f14cafb9874507a4d1f7b70b9a434a5' 
  AND token = 'sANf2EXGespSV7DoeZAIb9RfirSu+ipxl3dq87Uirxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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